"There is no need to act like a child," Osbourne wrote. "You could of (sic) happily joined us! It's not 2005 no one cares!"

Oh, I care. It's kind of a slow news day so far.

The Mirror reported Hilton approached Osbourne in an informal VIP area and called her a word also associated with female dogs because she thought Osbourne was ignoring her.

Heavens no.

In this Sunday, Feb. 24, 2013 file photo, TV personality Kelly Osbourne arrives at the 85th Academy Awards at the Dolby Theatre in Los Angeles. (Photo by John Shearer/Invision/AP, File)

Osbourne's mention of 2005 is apparently a reference to a feud between the two, which the New Post said started when Osbourne said Hilton was a bad influence on young girls. OMG, frownie face and stuff.

Hilton responded Monday, tweeting she didn't understand what was going on. Which, if you think about, is probably her normal state of mind.

"@KellyOsbourne, getting tweets about us," she wrote. "I'm confused, as I did not see you once this entire weekend. No clue how these stories get invented."